Jerry Seinfeld may be returning to master his domain — at least one more time.

The comedian, whose popular “Seinfeld” show ended in 1998 after a groundbreaking nine-year run, gave away some details about the project Thursday while appearing on a sports radio talk show, according to CBS New York.

Seinfeld, 59, was talking football on WFAN's Boomer and Carton show, when the hosts asked about the photo that recently hit the Internet of Seinfeld and former co-star Jason Alexander walking into Tom's Diner on Manhattan's Upper West Side (just as they had done so many times on the show).

Seinfeld said they weren't filming a commercial or an episode of Seinfeld's web series “Comedians in Cars Getting Coffee.” Instead, he referred to it as a “secret project.”

“I gave you more now than I've given anyone,” Seinfeld said. “I told you what it isn't. And then I also told you that it isn't not that, either.”

At least we can surmise it's not another movie about bees.

Seinfeld did say Alexander reprised his role as neurotic George Constanza while they filmed in the diner, that the project involves original co-creator Larry David, and that some of the other original show's characters are also involved.

He said it's a “shortish-form” project, but longer than 60 seconds and will go public “very very soon.” He also said the project is probably “one and done.”